Fish head soup is a food that is prepared with ingredients such as fish head and vegetables with stock, juice, water or another liquid. It is an Asian appetizer and is generally served hot with crusty breads or elegant grissini, savory biscuits, muffins, rice or pickles. Plenty of garlic, ginger and onions are the key to a yummy fish head soup recipes. Fish head soup is very nutritious and is a good source of omega-3.